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Enhanced Mechanical and Electromagnetic-Wave-Absorption Properties of Ceramic Matrix Composites Fabricated by Novel Laser-Machining-Assisted CVI
J. Wang, Y. Liu, L. Cheng, X. Chen, Q. Zhou, Z. Hou, F. Ye
Science and Technology on Thermostructure Compsite Materials Laboratory, Northwestern Polytechnical University, Xi'an, Shaanxi, 710072, China
received October 10, 2017, received in revised form November 21, 2017, accepted January 16, 2018
Vol. 9, No. 1, Pages 79-84 DOI: 10.4416/JCST2017-00080
Abstract
A novel technique based on laser-machining-assisted chemical vapor infiltration (LA-CVI) was proposed and developed to fabricate ceramic matrix composites (CMCs). The results showed that the compressive strength, the shear strength and the bending strength of the C/SiC composites increased by 50.7 %, 11.8 % and 17.8 %, respectively, compared with those of classical CVI-C/SiC composites. The improvement can be attributed to the reopening of the diffusion channels and formation of a dense band and a coating around the channels. On the other hand, the minimum reflection loss (RL) of the C/SiC composites fabricated by means of LA-CVI improved 307 % against that of CVI-C/SiC composites in the frequency range of 8 GHz to 18 GHz owing to the multiple reflection of the electromagnetic (EM) waves in periodic micro-holes. The advantages of the LA-CVI method with regard to improving mechanical properties and the EM-wave-absorption properties of CMCs were demonstrated.
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Keywords
Ceramic matrix composites, laser-machining-assisted CVI, mechanical properties, electromagnetic-wave-absorbing properties
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